C++

Use a PEM TLS Client Certificate

Demonstrates the Chilkat MailMan.SetSslClientCertPem method, which sets the client-side certificate for SSL/TLS connections, loading it from PEM data or from a PEM file. The first argument may contain the PEM text itself or a path to a PEM file; the second is the PEM password. This example loads the client certificate from a PEM file.

Background: PEM is the familiar Base64 text format bracketed by -----BEGIN CERTIFICATE----- lines, and a single PEM can hold both a certificate and its (optionally encrypted) private key. It is the common format in Unix/OpenSSL environments, whereas PFX is more typical on Windows. Because this method accepts either the PEM text or a filename, you can supply credentials straight from a config value or secret store without writing them to disk.

Chilkat C++ Downloads

Download Chilkat for C++

C++

#include <CkMailMan.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the MailMan.SetSslClientCertPem method, which sets the client-side
    //  certificate for SSL/TLS connections, loading it from PEM data or from a PEM file.  The
    //  1st argument may contain PEM text or a PEM file path; the 2nd is the PEM password.

    CkMailMan mailman;

    //  Configure the SMTP server connection.
    mailman.put_SmtpHost("smtp.example.com");
    mailman.put_SmtpPort(465);
    mailman.put_SmtpSsl(true);
    mailman.put_SmtpUsername("user@example.com");
    mailman.put_SmtpPassword("myPassword");

    //  Load the client certificate from a PEM file.
    success = mailman.SetSslClientCertPem("qa_data/certs/client.pem","pem_password");
    if (success == false) {
        std::cout << mailman.lastErrorText() << "\r\n";
        return;
    }

    success = mailman.VerifySmtpLogin();
    if (success == false) {
        std::cout << mailman.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Connected using a PEM TLS client certificate." << "\r\n";

    //  Note: The path "qa_data/certs/client.pem" is a relative local filesystem path,
    //  relative to the current working directory of the running application.
    }